本文演示根据对象属性对List中的对象去重
新建实体类
public class Person {private String id;private String name;public Person(String id, String name) {this.id = id;this.name = name;}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}}根据Person对象的id属性去重以及查看结果：
public class MainTest {public static void main(String[] args) {List list = new ArrayList();Person p1 = new Person("1", "123");Person p2 = new Person("2", "123");Person p3 = new Person("1", "456");list.add(p1);list.add(p2);list.add(p3);List result = list.stream().collect(Collectors.collectingAndThen(Collectors.toCollection(() -> new TreeSet (Comparator.comparing(p -> p.getId()))),ArrayList::new));for (Person person : result) {System.out.println(person.getId() + " " + person.getName());}}} 输出结果：
